<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
</head>
<style>
  div {
    background-color: #eee;
    font-size: 30px;
  }
</style>
<body>
  <div class="container">.container类设置布局容器</div>
</body>
</html>
